On Sep 8, 2013 6:17 PM, "Sandro Mani" <[email protected]> wrote: > > Hello, > > I would like to periodically (say every second) grab the latest frame from a rtsp live stream of a webcam. I am able to successfully open the stream and read and decode frames, however if I read one frame every second, I am still reading subsequent frames (as opposed to frames which are i.e. one second apart). I guess I need to seek to the last available frame before reading the next frame. Can anyone point out how this can be done? > > For reference, my code is here: [1] [2]. > > Thanks for any inputs. > > Sandro > > > [1] http://smani.fedorapeople.org/VideoCapture.hpp > [2] http://smani.fedorapeople.org/VideoCapture.cpp
If your webcam has GOP of 1 sec, e.g. GOP length = 30 and FPS = 30, you can skip to next second; otherwize, the correct strategy would be to decode all frames, but throw away all frames that you don't need. BR Alex Cohn
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